Os byddai'n well gennych weld y wybodaeth hon yn Gymraeg, cliciwch yma.
If you are visiting this site, you may have received one of our letters asking you to take part in our study. If you have already taken part, many thanks for your help and we hope you enjoyed the experience.
About the survey
The Welsh Health Survey is designed to collect information about the health of people in Wales. We aim to talk to everyone who is asked to take part to get an accurate picture of health in Wales. This information cannot be collected any other way.
The study is funded by the Welsh Assembly Government and is carried out by NatCen. It has been carried out each year since 2003.
Information is used to help monitor health of adults and children in Wales, and in different areas of Wales, and to help plan health services.
What happens next?
If your household has received a letter inviting you to take part, one of our interviewers will visit you in the next few weeks. This interviewer will be from NatCen (National Centre for Social Research) and will show you their photo ID.
The interviewer will be able to provide more information about the study and, if you agree to take part, carry out a short household interview with an adult in the household. The interviewer will ask a series of questions and record the answers.
All adults in the household will then be asked to complete a paper questionnaire. The interviewer will arrange to collect these at a later date.
The interviewer will also select up to 2 children aged 0-15 to complete a questionnaire. An adult will be asked to fill in a short questionnaire on behalf of selected children aged 0-12, and children aged 13-15 will be asked to complete a questionnaire on their own behalf.
The interviewer will also ask to measure the height and weight of selected children aged 2-15.
We hope you will be willing to take part, as your address has been specially chosen by random selection to be part of the study and we can't give your place to anyone else.
Types of questions
The questions included in this study will cover:
People who have already taken part in the study found it enjoyable and interesting, and we hope you will too.
Your personal details will be kept strictly confidential and no-one looking at the study findings will be able to identify you or your household in any way.
Please click the questions below to find out more.